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    <script>
        //编写函数has(arr , 60) 判断数组中是否存在60这个元素，返回布尔类型

        var arr = [1, 2, 3, 60]
        var arr2 = [1, 2, 3]
        var arr3 = [1, 2, 3,5,60,99,65]
        function has(one) {
            for (var i = 0; i < one.length; i++) {
                if (one[i] == 60) {
                    return true
                }
            }
            return false
        }
        console.log(has(arr)) // true
        console.log(has(arr2)) // false
        console.log(has(arr3))
    </script>
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